The current position:

AIR PIPE AUTOMATIC CLOSING DEVICES

release time:2015-12-03 14:12
This Guideline applies to approval and inspection of air pipe automatic closing devices in oil tanks (excluding cargo oil tanks) and water tanks of ships. For other types of air pipe closing devices, reference may be made to in this Chapter.
Download link:
P03AIR PIPE AUTOMATIC CLOSING DEVICES.pdf
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